Instrument barrel



FIG. 1 is a perspective view of my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a right side view thereof; the left side view being a mirror image;

FIG. 5 is a top view thereof;

FIG. 6 is a perspective view of a second embodiment of my new design;

FIG. 7 is a front elevational view of the second embodiment;

FIG. 8 is a rear elevational view of the second embodiment;

FIG. 9 is a right side view of the second embodiment; the left side view being a mirror image; and,

FIG. 10 is a top view of the second embodiment.

The stipple-like pattern shown on the clip and globe and the dashed lines shown on the lower portion of the instrument barrel in FIGS. 2 and 7, illustrate environmental matter, which form no part of the claimed design. 

The ornamental design for an instrument barrel, as shown and described. 